You're absolutely right. I'm a tremendous Next Generation fan and always thought it was cool that many crewmembers hung onto their ancestral traditions (ala Scotty wearing kilts and playing the bagpipe, or Kayko and Miles having a traditional Japanese wedding ceremony.) But they never delved into Christianity. Even when they had the chance, in the second movie, Wrath of Khan, when Bones was having a fit about the awsome power of the "Genesis Project." He said, "According to myth, the earth was created in seven days." So much for Christianity.
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KIRK
Give up Genesis, she said. What in God's name does that mean? Give it up to whom?
SPOCK
It might help my analysis if I knew what Genesis was. Beyond the Biblical reference.
KIRK
Uhura, have Doctor McCoy join us in my quarters.
(snip)
BONES (after viewing Project Genesis summary)
But dear Lord, do you think we're intelligent enough to - Suppose, what if this thing were used where life already exists?
SPOCK
It would destroy such life in favor of it's new matrix -
BONES
It's new - Do you have any idea what you're saying?
SPOCK
I was not attempting to evaluate its moral implications, Doctor. As a matter of cosmic history, it has always been easier to destroy than to create -
BONES
Not anymore! Now we can do both at the same time! According to myth, the earth was created in six days. Now watch out: here comes Genesis; we'll do it for you in six minutes
SPOCK
Really, Doctor McCoy, you must learn to govern your passions. They will be your undoing. Logic suggests -
BONES
Logic??
(to Kirk) My God! The man's talking about logic! We're talking about universal Armageddon!
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Interesting "Armageddon" reference - strong Judeo-Christian connotations there.